New paradigms of photonic state manipulation on synthetic platforms

Solid State & Optics Seminar Series

sponsored by “The Flint Fund Series on Quantum Devices and Nanostructures”

Wednesday, February 16, 2022


Via Zoom

Zoom Link :

Kai Wang, Ph.D

Department of Electrical Engineering, Stanford University

Kai Wang is currently a Postdoctoral Scholar in the Department of Electrical Engineering at Stanford University. Before Stanford, he received his PhD from The Australian National University in 2019. Prior to that, he obtained MSc from Friedrich-Schiller-Universität Jena and BE from Tianjin University. His research interests include quantum photonics, non-Hermitian topological photonics, and metasurfaces.

New paradigms of photonic state manipulation on synthetic platforms

Photons, the particles of light, are ideal carriers of quantum and classical information. My research focuses on employing fundamental physics concepts and advanced photonics technology for the unconventional manipulation of photons in their intrinsic degrees of freedom, from polarization to spatial modes to frequency.

The first part of the talk will be on nanostructured metasurfaces for quantum photonics. I will show our experimental results that use metasurfaces for the interference, tomographic measurement, and nontrivial transformation of multiphoton quantum states encoded in the polarization degree of freedom.

The second part will focus on non-Hermitian topological photonics in synthetic dimensions. I will show how we implement lattice Hamiltonians with unprecedented flexibility using discrete frequency modes of photons in a dynamically modulated system. I will show how we judiciously use losses to achieve topological invariants, from nontrivial winding numbers to braids/knots formed by the complex-energy non-Hermitian bands.

The last part of my talk will show where my works and expertises point to in the future. I will share my visions and plans on developing scalable quantum interconnect and simulation platforms based on new paradigms of manipulation of multidimensional photonic states encoded in intrinsic degrees of freedom. This includes transformative meta-optics elements and a versatile quantum photonic simulator based on frequency/time encoding.

Event time: 
Wednesday, February 16, 2022 - 1:00pm
Presented By: 
Kai Wang, Ph.D
Applied Physics
Hosted By: 
Professor Hui Cao